What sum will give Rs 244/- as the difference between simple interest and compound interest at 10% pa in 1½ years compounded half-yearly?
If a = 42 and b = 18, the value of a(a2 - 3a + 3) - b(b2 + 3b + 1) is
20 men can finish a work in 30 days. They started working, but 4 men left the work after 10 days. In how many days would the work be completed?
If sec2 α + 4 cos2α = 4 and 0° ≤ α ≤ 90°, then find the value of α.
18 men can complete a certain work in 15 days working 8 hours a day. How many men can complete the same work in 12 days working 9 hours a day?